From 1851799e1d2978f68eea5d9dff322e121dcf59c1 Mon Sep 17 00:00:00 2001
From: Ido Schimmel <idosch@mellanox.com>
Date: Wed, 10 Jul 2019 13:14:52 +0300
Subject: [PATCH] thermal: Fix use-after-free when unregistering thermal zone device
Git-commit: 1851799e1d2978f68eea5d9dff322e121dcf59c1
Patch-mainline: v5.4-rc1
References: bsc#1051510
thermal_zone_device_unregister() cancels the delayed work that polls the
thermal zone, but it does not wait for it to finish. This is racy with
respect to the freeing of the thermal zone device, which can result in a
use-after-free [1].
Fix this by waiting for the delayed work to finish before freeing the
thermal zone device. Note that thermal_zone_device_set_polling() is
never invoked from an atomic context, so it is safe to call
cancel_delayed_work_sync() that can block.
[1]
[ +0.002221] ==================================================================
[ +0.000064] BUG: KASAN: use-after-free in __mutex_lock+0x1076/0x11c0
[ +0.000016] Read of size 8 at addr ffff8881e48e0450 by task kworker/1:0/17
[ +0.000023] CPU: 1 PID: 17 Comm: kworker/1:0 Not tainted 5.2.0-rc6-custom-02495-g8e73ca3be4af #1701
[ +0.000010] Hardware name: Mellanox Technologies Ltd. MSN2100-CB2FO/SA001017, BIOS 5.6.5 06/07/2016
[ +0.000016] Workqueue: events_freezable_power_ thermal_zone_device_check
[ +0.000012] Call Trace:
[ +0.000021] dump_stack+0xa9/0x10e
[ +0.000020] print_address_description.cold.2+0x9/0x25e
[ +0.000018] __kasan_report.cold.3+0x78/0x9d
[ +0.000016] kasan_report+0xe/0x20
[ +0.000016] __mutex_lock+0x1076/0x11c0
[ +0.000014] step_wise_throttle+0x72/0x150
[ +0.000018] handle_thermal_trip+0x167/0x760
[ +0.000019] thermal_zone_device_update+0x19e/0x5f0
[ +0.000019] process_one_work+0x969/0x16f0
[ +0.000017] worker_thread+0x91/0xc40
[ +0.000014] kthread+0x33d/0x400
[ +0.000015] ret_from_fork+0x3a/0x50
[ +0.000020] Allocated by task 1:
[ +0.000015] save_stack+0x19/0x80
[ +0.000015] __kasan_kmalloc.constprop.4+0xc1/0xd0
[ +0.000014] kmem_cache_alloc_trace+0x152/0x320
[ +0.000015] thermal_zone_device_register+0x1b4/0x13a0
[ +0.000015] mlxsw_thermal_init+0xc92/0x23d0
[ +0.000014] __mlxsw_core_bus_device_register+0x659/0x11b0
[ +0.000013] mlxsw_core_bus_device_register+0x3d/0x90
[ +0.000013] mlxsw_pci_probe+0x355/0x4b0
[ +0.000014] local_pci_probe+0xc3/0x150
[ +0.000013] pci_device_probe+0x280/0x410
[ +0.000013] really_probe+0x26a/0xbb0
[ +0.000013] driver_probe_device+0x208/0x2e0
[ +0.000013] device_driver_attach+0xfe/0x140
[ +0.000013] __driver_attach+0x110/0x310
[ +0.000013] bus_for_each_dev+0x14b/0x1d0
[ +0.000013] driver_register+0x1c0/0x400
[ +0.000015] mlxsw_sp_module_init+0x5d/0xd3
[ +0.000014] do_one_initcall+0x239/0x4dd
[ +0.000013] kernel_init_freeable+0x42b/0x4e8
[ +0.000012] kernel_init+0x11/0x18b
[ +0.000013] ret_from_fork+0x3a/0x50
[ +0.000015] Freed by task 581:
[ +0.000013] save_stack+0x19/0x80
[ +0.000014] __kasan_slab_free+0x125/0x170
[ +0.000013] kfree+0xf3/0x310
[ +0.000013] thermal_release+0xc7/0xf0
[ +0.000014] device_release+0x77/0x200
[ +0.000014] kobject_put+0x1a8/0x4c0
[ +0.000014] device_unregister+0x38/0xc0
[ +0.000014] thermal_zone_device_unregister+0x54e/0x6a0
[ +0.000014] mlxsw_thermal_fini+0x184/0x35a
[ +0.000014] mlxsw_core_bus_device_unregister+0x10a/0x640
[ +0.000013] mlxsw_devlink_core_bus_device_reload+0x92/0x210
[ +0.000015] devlink_nl_cmd_reload+0x113/0x1f0
[ +0.000014] genl_family_rcv_msg+0x700/0xee0
[ +0.000013] genl_rcv_msg+0xca/0x170
[ +0.000013] netlink_rcv_skb+0x137/0x3a0
[ +0.000012] genl_rcv+0x29/0x40
[ +0.000013] netlink_unicast+0x49b/0x660
[ +0.000013] netlink_sendmsg+0x755/0xc90
[ +0.000013] __sys_sendto+0x3de/0x430
[ +0.000013] __x64_sys_sendto+0xe2/0x1b0
[ +0.000013] do_syscall_64+0xa4/0x4d0
[ +0.000013] entry_SYSCALL_64_after_hwframe+0x49/0xbe
[ +0.000017] The buggy address belongs to the object at ffff8881e48e0008
which belongs to the cache kmalloc-2k of size 2048
[ +0.000012] The buggy address is located 1096 bytes inside of
2048-byte region [ffff8881e48e0008, ffff8881e48e0808)
[ +0.000007] The buggy address belongs to the page:
[ +0.000012] page:ffffea0007923800 refcount:1 mapcount:0 mapping:ffff88823680d0c0 index:0x0 compound_mapcount: 0
[ +0.000020] flags: 0x200000000010200(slab|head)
[ +0.000019] raw: 0200000000010200 ffffea0007682008 ffffea00076ab808 ffff88823680d0c0
[ +0.000016] raw: 0000000000000000 00000000000d000d 00000001ffffffff 0000000000000000
[ +0.000007] page dumped because: kasan: bad access detected
[ +0.000012] Memory state around the buggy address:
[ +0.000012] ffff8881e48e0300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ +0.000012] ffff8881e48e0380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ +0.000012] >ffff8881e48e0400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ +0.000008] ^
[ +0.000012] ffff8881e48e0480: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ +0.000012] ffff8881e48e0500: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb
[ +0.000007] ==================================================================
Fixes: b1569e99c795 ("ACPI: move thermal trip handling to generic thermal layer")
Reported-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Ido Schimmel <idosch@mellanox.com>
Acked-by: Jiri Pirko <jiri@mellanox.com>
Signed-off-by: Zhang Rui <rui.zhang@intel.com>
Acked-by: Takashi Iwai <tiwai@suse.de>
---
drivers/thermal/thermal_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/thermal/thermal_core.c
+++ b/drivers/thermal/thermal_core.c
@@ -299,7 +299,7 @@ static void thermal_zone_device_set_poll
mod_delayed_work(system_freezable_wq, &tz->poll_queue,
msecs_to_jiffies(delay));
else
- cancel_delayed_work(&tz->poll_queue);
+ cancel_delayed_work_sync(&tz->poll_queue);
}
static void monitor_thermal_zone(struct thermal_zone_device *tz)